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Against Discount Rates

That wasn't me; I guess I'll post under this name from now on.

"There is a financial argument against the possibility time travel that was published in a journal (don't have the citation offhand): if it were possible to time-travel, interest rates would be arbitraged to zero."

I'd say this is a special case of the Fermi Paradox for Time Travel. If people can reach us from the future, where are they?